The primary challenge in analyzing the shadow blister arises when the transverse distance between the two edges along the X-axis is either large or when the slit width reaches zero and the secondary barrier overlaps the primary barrier, rendering the "Fresnel Integral" valid. In such scenarios, this phenomenon can also be interpreted using traditional ray theory. As the transverse distance decreases to approximately a millimeter, the validity of the "Fresnel Integral" diminishes. Regrettably, this narrow transverse distance has often been overlooked. This article explores various scenarios where the transverse distance is either large or less than a millimeter, and where the secondary barrier overlaps the primary barrier. Notably, complexity arises when the transverse distance is very small. In such conditions, the Fourier transform is valid only if we consider a complex refractive index, indicating an inhomogeneous fractal space with a variable refractive index near the surface of the obstacles. This variable refractive index introduces a time delay in the temporal domain, resulting in a specific dispersion region underlying the diffraction phenomenon. Refer to: http://www.ej-physics.org/index.php/ejphysics/article/view/304
The shadow blister effect is a visual effect whereby adjacent shadows appear to bulge (or blister) towards one another when cast by one or more non-point light sources. It is the result of overlapping shadow penumbra on the surface and the perception by the brain of a contrast barrier formed by the merging of the penumbra.
Your interpretation demonstrated you just explained your imagination rather than a proper experimental consideration. Please take time and see:
http://www.ej-physics.org/index.php/ejphysics/article/view/304
or at ResearchGate:
https://www.researchgate.net/publication/380362016_Precision_Modulation_and_the_Shadow_Blister_Phenomenon_in_Optical_Diffraction_Using_Straight-Edge_Apertures
Best regards,
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